James e



Y @latten tatra ateat ffice.`

i .TA MES E.- EMERSON, or TEENffroN, NEw JERSEY.

' Laim man No. 66,693, ma erua,16,1867.-

TO ALL WHOM IT MAY CONOERN:

Be it known that I, JAMES E. EMERSON, ot' Trenton,-in the county of Mercer, and Stute ot' New Jersey, have invented certain new and useful Improvements'in Saw-Gummers; and I do hereby declare the following to be a full, clear, and exact description o'f the same, reference being had to the accompanying` drawings, which V are made part of this specification, and in whichl Figure 1 isa plan of a saw-gummer, illustrating my invention; and Figure 2 is aside elevation of the same. FiguresS and 4 are detached views, illustrating burrs or cutters of different sizes. r Similar letters of reference indicate corresponding parts in the several figures.

`This invention relates to certain improvements on the saw-glimmer for which Letters Patent of the United tates have been granted to me, the saine being numbered 62,948, and bearing date' March 19, 1807. 'lhat jgummer embraces features which are exhibited in this, and which therefore need not be particularly described, to wit, the clamp or thumb-screws acting as pivots, the rotary cutter operated by a crank-handle, and the adjustable handle by which the instrument is held when in operation. In the aforesaid patented gunnner provision is made for the employment of a' cutteriof one size only, which cutter is not adapted for adjustment, 'Which-I have fou-nd to b e necessary in order to bring -it into -the most convenientposition -for operation. V'In the gummeiy the subject of this invention, provision ismade for the employment ot' cutters of different sizes, and also for the adjustment of the operating cutter toward or away from the'thumb-screws,as well' as from one side to the other of the stock or holding-frame.

r In order that'vothers skilled in the'art to which my invention appertains may be enabled to :fully understand and use' the same, I will proceed to describe it in detail.

I n the accompanying drawings, A. may represent the stock or body `of the instrument; B, thejrdjustable handle; and C, the thumb-screws for clamping the instrument to the saw-blade. D represents the rotary V burr or cutter, operated by means of the crank-handle E, which is attached to the projecting axis of the said cutter by means of the thumb-screw 0.3 F F represent a two-part toolholdcr, in which the cutter' D is mounted to rotate. l One feature of this improvement consists in providing the tool-holder F F with apertures or bearings fff2, which are respectively adapted` to accommodate the axes or journals of large and small cutters, different sizes of which are represented in gs. V3 and 4. Hence'the cutter in the tool-holdermay be replaced by a larger or a smaller cutter, according to the size of the teeth of the saw to be operated upon. The toolvholder F F is cast or formed separately or independently of the stock A, and is secured to the same by the set-screws G G, to receive which the stock is provided with slots at H II, which enable the. tool-holder to be adjusted so as to' set the cutter D toward or away from the thumb-screws'C C. This adjustment adapts the cutter to be brought' to the root of the teeth or point of operation thereon when the clamp-screws cannot be conveniently applied so as to attain that end. It will be seen that the nature ofthe work oftentimes renders it desirable, if not necessary, to transfer the cutter D and crank-handle E to the opposite side of the stock A. `In this device the set-screws G Gr enable the tool-holder F F, together with the crank-handle E and cutter D, to be shifted froml side to side at will, the position of the handle B being reversed accordingly. This change of position is represented in red r. in The stock L is termed with a curve, A', at its upper end, to adapt it to the diierent shapes and sizes l i of saws and saw-teeth, so `that by placing the cutter-bearings ou one side or the other of the stock the position oi' the cutters, relatively to the pivot-screws c, may be varied as required.

having thus described my invention, what I claim as new herein, and desire to secure by Letters Patent, ifs- The adjustable and reversible bearings F F, constructed and applied to the curved stoel: A A', in the manner and for the purpose set forth. t

i J. E. EMERSON. Witnesses:

Cms D, Salmi, p i Unas. A.. PEr'rrr. f" 

